No. 5.4. uses the command perfparse_nagios_command.pl to append data to a file and perfparse-log2mysql to read the data from that file.
5.5. uses perfparse_nagios_pipe_command.pl to write the data to a named pipe (Fifo pipe, read the manpage to mkfifo for more information) and then uses perfparsed to read the data of that pipe. You have to be sure that the ServiceLog
config option starts with a | and that the service log is not a file but a pipe.